Investigation on current loss of high-power vacuum transmission lines with coaxial-disk transitions by particle-in-cell simulations  

作　　者：Wei LUO Jianwei ZHANG Yongdong LI Hongguang WANG Chunliang LIU Pengfei ZHANG Fan GUO 罗伟;张建威;李永东;王洪广;刘纯亮;张鹏飞;郭帆(Department of Applied Physics,Xi’an University of Technology,Xi’an 710048,People's Republic of China;Key Laboratory for Physical Electronics and Devices of the Ministry of Education,School of Electronic Science and Engineering,Xi'an Jiaotong University,Xi’an 710049,People's Republic of China;State Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi'an 710024,People's Republic of China;Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,People's Republic of China)

机构地区：[1]Department of Applied Physics,Xi’an University of Technology,Xi’an 710048,People's Republic of China [2]Key Laboratory for Physical Electronics and Devices of the Ministry of Education,School of Electronic Science and Engineering,Xi'an Jiaotong University,Xi’an 710049,People's Republic of China [3]State Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi'an 710024,People's Republic of China [4]Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,People's Republic of China

出　　处：《Plasma Science and Technology》2021年第11期177-184,共8页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.U1530133 and 52007152);the Special Foundation of State Key Laboratory of Intense Pulsed Radiation Simulation and Effect(No.SKLIPR2005);the Youth Innovation Team of Shaanxi Universities。

摘　　要：Coaxial-disk transitions can generate non-uniform magnetic fields and abrupt impedance variations in magnetically insulated transmission lines(MITLs),resulting in disturbed electron flow and non-negligible current loss.In this paper,3 D particle-in-cell simulations are conducted with UNPIC-3 d to investigate the current loss mechanism and the influence of the input parameters of the coaxial-disk transition on current loss in an MITL system.The results reveal that the magnetic field non-uniformity causes major current loss in the MITL after the coaxialdisk transition,and the non-uniformity decreases with the distance away from the transition.The uniformity of the magnetic field is improved when increasing the number of feed lines of a linear transformer driver-based accelerator with coaxial-disk transitions.The number of input feed lines should be no less than four in the azimuthal distribution to obtain acceptable uniformity of the magnetic field.To make the ratio of the current loss to the total current of the accelerator less than 2%at peak anode current,the ratio of the current in each feed line to the total current should be no less than 8%.

关 键 词：magnetically insulated transmission line coaxial-disk transition current loss 

分 类 号：TL62[核科学技术—核技术及应用]